package com.sky.interceptor;

import com.sky.constant.JwtClaimsConstant;
import com.sky.context.BaseContext;
import com.sky.properties.JwtProperties;
import com.sky.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenUserInterceptor implements HandlerInterceptor {

    @Autowired
    private JwtProperties jwtProperties;

    @Resource
    private StringRedisTemplate stringRedisTemplate;
    /**
     * 校验jwt
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }
        log.info("拦截到了请求,{}", request.getRequestURL());
        //1、从请求头中获取令牌
        String token = request.getHeader(jwtProperties.getUserTokenName());
        //1.2判断令牌是否存在
        if(!StringUtils.hasLength(token)){
            log.info("请求头中不存在令牌");
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return false;
        }
        //校验redis中login_token_+username的key是否过期
         String key="login_token_"+token;
        String s = stringRedisTemplate.opsForValue().get(key);
        if(!org.apache.commons.lang3.StringUtils.isNotEmpty(s)){
            log.info("令牌过期");
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return false;
        }

        //2、校验令牌
        try {
            log.info("jwt校验:{}", token);
            Claims claims = JwtUtil.parseJWT(jwtProperties.getUserSecretKey(), token);
            Long id = Long.valueOf(claims.get(JwtClaimsConstant.USER_ID).toString());
            BaseContext.setCurrentId(id);
            log.info("用户id", id);
            //3、通过，放行
            return true;
        } catch (Exception ex) {
            //4、不通过，响应401状态码
            //令牌非法
            log.info("令牌非法");
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return false;
        }
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        BaseContext.removeCurrentId();
    }
}
